add_symlink

# File lib/rubygems/package/tar_writer.rb, line 238
  def add_symlink(name, target, mode)
    check_closed

    name, prefix = split_name name

    header = Gem::Package::TarHeader.new(:name => name, :mode => mode,
                                         :size => 0, :typeflag => "2",
                                         :linkname => target,
                                         :prefix => prefix,
                                         :mtime => ENV["SOURCE_DATE_EPOCH"] ? Time.at(ENV["SOURCE_DATE_EPOCH"].to_i).utc : Time.now).to_s

    @io.write header

    self
  end